After using an App, how can I delete it from running in the background. Such usage seems to be slowing my phone considerably?
Most of your apps don't run in the background. When you double tap the home button, you are bringing up the fast app switching bar - this doesn't show you what's running in the background, just what you've recently used.
Anyhow, you can remove them from your fast app switching bar by holding your finger down on one until it jiggles - just like you would when you delete an app - and then click the x.
Again, this will remove them from your list of recently used apps, but most of them are not running in the background anyway, so it won't effect the speed of your phone.
That won't work with the 3G. It doesn't have app switching. It was disabled on the the first 2 gen iPhones. Well 3G since the 1st gen didn't even get iOS 4
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